Row_NUMBER () Function

CREATE TABLE [dbo].[Employees1]
(
[Id] [int] NOT NULL,
[Name] [nvarchar](50) NULL,
[Dept] [nvarchar](50) NULL,
[Gender] [nvarchar](50) NULL,
[Country] [nvarchar](50) NULL,
[Salary] [float] NULL,
)

Insert into Employees Values(1,'John','IT','Male','UK',5000)
Insert into Employees Values(2,'Mary','HR','Female','India',3000)
Insert into Employees Values(3,'Todd','IT','Male','UK',3500)
Insert into Employees Values(4,'Pam','HR','Female','India',4000)
Insert into Employees Values(5,'Tatcher','Payroll','Male','USA',2000)
Insert into Employees Values(6,'Sunil','IT','Male','USA',1400)
Insert into Employees Values(7,'Hari','Payroll','Male','UK',2500)
Insert into Employees Values(8,'Sunitha','HR','Female','India',4000)
Insert into Employees Values(9,'Sneha','IT','Female','India',3000)
Insert into Employees Values(10,'Ruby','Payroll','Male','UK',4600)

Select Name, Gender,Salary, 
Row_NUMBER () OVER (Order by Gender) as RowNo
From Employees

-- so here all the rows will have rownumber start with 1 till end

Select Name, Gender,Salary, 
Row_NUMBER () OVER (Partition by Gender Order by Gender) as RowNo
From Employees

-- so here when the partition will change then the Rownumber will reset and start with 1